Hi,
Have you tried to download the stream and run ffprobe on it? Most likely,
shoutcast isn't reporting the correct value.
Romain
2017-07-13 10:39 GMT-05:00 Alex LaBranche <[email protected]>:
> Does anyone have any insight on this?
>
>
>> On Jul 5, 2017, at 12:44 24AM, Alex LaBranche <[email protected]>
wrote:
>>
>> It seems that when I'm using fdkaac (the only aac encoder available now
from the looks of it) the highest bitrate it will output is 64k
>>
>> This is what I have configured...
>>
>>
output.shoutcast(%fdkaac(channels=2,bitrate=256,samplerate=44100),icy_id=5,icy_metdata="true",
name="Radio - 256k
HE-AACv2",genre="Genre",url="https://www.domain.com",host="127.0.0.1",port
= 80,password = "radio:#5",radio)
>>
>>
output.shoutcast(%fdkaac(channels=2,bitrate=128,samplerate=44100),icy_id=6,icy_metdata="true",name="Radio
- 128k
HE-AACv2",genre="Genre",url="https://www.domain.com",host="127.0.0.1",port
= 80,password = "radio:#6",radio)
>>
>>
output.shoutcast(%fdkaac(channels=2,bitrate=64,samplerate=44100),icy_id=7,icy_metdata="true",name="Radio
- 64k HE-AACv2",genre="Genre",url="https://www.domain.com",host="127.0.0.1",port
= 80,password = "radio:#7",radio)
>>
>>
output.shoutcast(%fdkaac(channels=2,bitrate=24,samplerate=44100),icy_id=8,icy_metdata="true",name="Radio
- 24k HE-AACv2",genre="Genre",url="https://www.domain.com",host="127.0.0.1",port
= 80,password = "radio:#8",radio)
>>
>> I have a separate script thats basically the same but its outputting mp3
(to the first 4 sid's on the sc_serv)
>>
>>
>> The Shoutcast status page reports the correct bitrate, but reports half
the sample rate
>>
>> HE-AAC @ 256 kbps, 22.05 kHz
>> HE-AAC @ 128 kbps, 22.05 kHz
>> HE-AAC @ 64 kbps, 22.05 kHz
>> HE-AAC @ 24 kbps, 22.05 kHz
>>
>> Odd.. ok... lets have a closer look...
>>
>>
>> $ ffprobe -hide_banner http://127.0.0.1/stream/?sid=5
>> Input #0, aac, from 'http://127.0.0.1/stream/?sid=5':
>> Metadata:
>> icy-notice1 : <BR>This stream requires <a href="
http://www.winamp.com";>Winamp</a><BR>
>> icy-notice2 : SHOUTcast DNAS/posix(linux x64) v2.5.1.724<BR>
>> icy-name : Radio
>> icy-genre : Genre
>> icy-br : 256
>> icy-sr : 22050
>> icy-url : https://www.domain.com
>> icy-pub : 1
>> Duration: N/A, bitrate: 62 kb/s
>> Stream #0:0: Audio: aac (HE-AACv2), 44100 Hz, stereo, fltp, 62 kb/s
>>
>>
>> So liquidsoap is sending the configured bitrate, and half the configured
samplerate as metadata
>>
>> But is actually sending at 64kbps 44100 Hz
>>
>>
>> A look at the 24k...
>>
>> icy-br : 24
>> icy-sr : 22050
>> icy-url : https://www.domain.com
>> icy-pub : 1
>> Duration: N/A, bitrate: 22 kb/s
>> Stream #0:0: Audio: aac (HE-AACv2), 44100 Hz, stereo, fltp, 22 kb/s
>>
>> Ok its got the bitrate and the sample rate correct in the actual stream,
but again fails at the icy-sr at only half
>>
>> And for the 128k...
>>
>> icy-br : 128
>> icy-sr : 22050
>> icy-url : https://www.domain.com
>> icy-pub : 1
>> Duration: N/A, bitrate: 64 kb/s
>> Stream #0:0: Audio: aac (HE-AACv2), 44100 Hz, stereo, fltp, 64 kb/s
>>
>> And the 64k...
>>
>> icy-br : 64
>> icy-sr : 22050
>> icy-url : https://www.domain.com
>> icy-pub : 1
>> Duration: N/A, bitrate: 66 kb/s
>> Stream #0:0: Audio: aac (HE-AACv2), 44100 Hz, stereo, fltp, 66 kb/s
>>
>>
>> Now lets try mediainfo
>>
>> 256k
>>
>> General
>> Complete name : http://127.0.0.1/stream/?sid=5
>> Format : ADTS
>> Format/Info : Audio Data Transport Stream
>> Overall bit rate mode : Variable
>>
>> Audio
>> Format : AAC
>> Format/Info : Advanced Audio Codec
>> Format version : Version 4
>> Format profile : HE-AACv2 / HE-AAC / LC
>> Bit rate mode : Variable
>> Channel(s) : 2 channels / 1 channel / 1
channel
>> Channel positions : Front: L R / Front: C /
Front: C
>> Sampling rate : 44.1 kHz / 44.1 kHz / 22.05
kHz
>> Frame rate : 21.533 FPS (1024 spf)
>> Compression mode : Lossy
>> Stream size : 0.00 Byte
>>
>>
>> 128k
>>
>> General
>> Complete name : http://127.0.0.1/stream/?sid=6
>> Format : ADTS
>> Format/Info : Audio Data Transport Stream
>> Overall bit rate mode : Variable
>>
>> Audio
>> Format : AAC
>> Format/Info : Advanced Audio Codec
>> Format version : Version 4
>> Format profile : HE-AACv2 / HE-AAC / LC
>> Bit rate mode : Variable
>> Channel(s) : 2 channels / 1 channel / 1
channel
>> Channel positions : Front: L R / Front: C /
Front: C
>> Sampling rate : 44.1 kHz / 44.1 kHz / 22.05
kHz
>> Frame rate : 21.533 FPS (1024 spf)
>> Compression mode : Lossy
>> Stream size : 0.00 Byte
>>
>>
>> 64k
>>
>> General
>> Complete name : http://127.0.0.1/stream/?sid=7
>> Format : ADTS
>> Format/Info : Audio Data Transport Stream
>> Overall bit rate mode : Variable
>>
>> Audio
>> Format : AAC
>> Format/Info : Advanced Audio Codec
>> Format version : Version 4
>> Format profile : HE-AACv2 / HE-AAC / LC
>> Bit rate mode : Variable
>> Channel(s) : 2 channels / 1 channel / 1
channel
>> Channel positions : Front: L R / Front: C /
Front: C
>> Sampling rate : 44.1 kHz / 44.1 kHz / 22.05
kHz
>> Frame rate : 21.533 FPS (1024 spf)
>> Compression mode : Lossy
>> Stream size : 0.00 Byte
>>
>>
>> 24k
>>
>> General
>> Complete name : http://127.0.0.1/stream/?sid=8
>> Format : ADTS
>> Format/Info : Audio Data Transport Stream
>> Overall bit rate mode : Variable
>>
>> Audio
>> Format : AAC
>> Format/Info : Advanced Audio Codec
>> Format version : Version 4
>> Format profile : HE-AACv2 / HE-AAC / LC
>> Bit rate mode : Variable
>> Channel(s) : 2 channels / 1 channel / 1
channel
>> Channel positions : Front: L R / Front: C /
Front: C
>> Sampling rate : 44.1 kHz / 44.1 kHz / 22.05
kHz
>> Frame rate : 21.533 FPS (1024 spf)
>> Compression mode : Lossy
>> Stream size : 0.00 Byte
>>
>>
>> Looks like the channels are procreating and is reporting as variable
bitrate when the default for fdkaac is cbr.
>>
>> From their docs..
>>
>> • AACENC_BITRATEMODE Bitrate mode. Configuration can be different
kind of bitrate configurations- :
>>
>> <page37image15360.png>
>> 0: Constant bitrate, use bitrate according to AACENC_BITRATE. (default)
Within none LD/ELD ::AUDIO_OBJECT_TYPE, the CBR mode makes use of full
allowed bitreservoir. In contrast, at Low-Delay ::AUDIO_OBJECT_TYPE the
bitreservoir is kept very small.
>> 8: LD/ELD full bitreservoir for packet based transmission.
>>
>>
>> $ liquidsoap --version
>> Liquidsoap 1.3.1 (git://
github.com/savonet/liquidsoap.git@cbfcd6004d7dba7211cd1d33a38fe192e1da9219:20170702:171027
)
>>
>> This is all very odd so if anyone can shed some light that would be
awesome...
>>
>> Cheers,
>>
>> -alex
>>
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